We are still waiting on the fix, and we have sent them several Support Packages. They did tell us that the problem MAY come from a known workflow:
"We suspect that the following workflow causes the issue in Teamwork:
1. Create an element (e.g. a wall), and set a custom property to the element.
2. Use either the Drag a Copy or Mirror a Copy or Rotate a copy function.
3. Send the modifications.
4. Delete the previously created copied element.
5. Send the modifications. >>> Error"
It's also interesting to note that we've seen several error messages that mean the same thing. One even says something like "your file is ok, but we're not certain if it sync'd with the server, please try again", over and over.
There is a Preview version of a Hotfix Update, Build 4003/4004, available in the Graphisoft support site. However, we're very reticent to try a Preview. The phrase "Out of the frying pan, into the fire" comes to mind.
Chuck Kottka
Orcutt Winslow
Phoenix, Arizona, USA
ArchiCAD 25 (since 4.5)
Macbook Pro 15" Touchbar OSX 10.15 Core i7 2.9GHz/16GB RAM/Radeon Pro560 4GB